Fragments of extensively ulcerated synovial lining with dense infiltration by neutrophils, lymphocytes, plasma cells and macrophages with vascular endothelial proliferation and macrophages. No evidence of specific granulomas. No evidence of atypia or malignancy.
Right knee swelling
One soft tissue piece measured 2.3x1x0.8 cm, totally embedded.
Rt. Knee joint swelling, excision biopsy: